WASHINGTON (Reuters) - General Motors Co <GM.N> said that Obama era rules aiming to hike fleetwide fuel efficiency to more than 50 miles per gallon by 2025 are "not technologically feasible or economically practicable" and called for a more modest annual increase in requirements.

The largest U.S. automaker said in comments made public on Monday that it does not endorse a Trump administration proposal to freeze fuel efficiency requirements at 2020 levels, and said it instead favours an increase in standards based on "historic rates."

(Reporting by David Shepardson in Washington; Editing by Matthew Lewis)

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